JPS61162473A - Controller for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elevator control device, and particularly to an elevator control device that executes various controls using a microcomputer.

[Conventional technology]

In recent years, with the rapid development of semiconductor technology, various microcomputers (hereinafter referred to as MPUs) have been developed. Also, in various industrial equipment, M
By using the PU, various altitude controls are performed. Here, since the elevator also requires various complicated controls, for example, as shown in Fig. 6,
Control has been shifted to using an MPU as disclosed in Japanese Patent No. 22869.

In the figure, 1 is an MPU whose input/output terminals are connected to an input/output circuit 2. Reference numeral 3 is an amplifier for amplifying the output signal of the output capacitor (PO) in the input/output circuit 2, and 4 is a three-phase AC power supply, which is connected to the contact 5a of the starting relay. Reference numeral 6 denotes a motor control circuit, which controls the output of the three-phase AC power supplied via the contact 5a in accordance with the output signal of the amplifier 3. 7 is a current detector that detects the current supplied from the motor control circuit 6 to the hoisting motor 8, and its output signal is input to the input capacitor (PI) of the input/output circuit 2;
supplied to A speed detector 9 is connected to the rotating shaft of the hoisting motor 8 to detect its rotational speed, and its output signal is supplied to the input capo Pl of the input/output circuit 2.

10 is MPU'f! connected to the output port P O2 of the input/output circuit 2. h operation monitoring circuit, the output end of which is connected to the relay 11. 12 is a running command switch connected to the input port P■3 of the input/output circuit 2; 13
A check switch is connected to the input port Pl of the input/output circuit 2, and is used to check the operation of the MPU operation monitoring circuit 10. 14 is input/output circuit 2
This is a relay for elevator emergency stop control connected to the output port (PO3).

In the elevator control device configured as described above,
When the starting relay to which the starting command is issued is energized, its contact 5a is closed. Next, when the travel command switch 12 is closed, the output signal is transmitted to the MP via the input/output circuit 2.
Since the signal is supplied to the UI, the MPUI executes an operation to obtain the difference between the output signal of the speed detector 9 and the speed reference value.

The difference signal obtained by this calculation is supplied to the amplifier 3 via the input/output circuit 2, where it is amplified and supplied to the motor control device 6 as a control signal. 1. The motor control device 6 controls the hoisting motor 8 by controlling the electric power supplied to the hoisting motor 8 according to a control signal corresponding to the difference between the current rotational speed of the hoisting motor 8 and a speed reference value. The speed is changed according to a predetermined speed reference pattern. Furthermore, when the MPUI detects overspeed or overcurrent, it drives the relay 14 via the input/output circuit 2 to bring the elevator to an emergency stop.

Here, if MPUI breaks down for some reason, M
Since the PUI performs all controls and monitors malfunctions, this becomes a very dangerous situation. For this purpose, M.P.
In U control, it becomes necessary to monitor the operation of the MPU itself. The operation of the MPUI is monitored by the MPU operation monitoring circuit 10, and if the MPUI malfunctions, the output signal of the MPU operation monitoring circuit 10 is cut off, so the relay 11 is restored and makes an emergency stop. It turns out.

Since the elevator is used to carry people, it is necessary to ensure reliability, and as a result, it becomes necessary for humans to periodically confirm that the MPU operation monitoring circuit 10 is normal. The switch 13 is operated to perform this confirmation, and when this switch 13 is closed, the MPU operation monitoring circuit 10 is forcibly supplied with a message similar to that of an MPUI malfunction. Therefore, if the MPU operation monitoring circuit 10 is normal, the MPU operation monitoring circuit 10 will operate almost simultaneously with the operation of the switch 13, and the relay 1 will be activated.
Since 1 is switched, confirmation can be performed.

[Problem that the invention seeks to solve]

However, in the elevator control device using the MPU configured as described above, it is necessary to periodically check the operation of the MPU operation monitoring circuit, which requires time and effort. Also, the human check period is half a month ~
Since it is an extremely long period of one month, problems arise such as the inability to check for failures that occur during that time.

The present invention was made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an elevator control device that can run only when the MPU is normal.

[Means for solving problems]

In the elevator control device according to the present invention, the MPU supplies an operation check signal to the MPU operation monitoring circuit at the same time as the elevator start relay is activated, and if a response to this is not returned within a predetermined time, the MPU operation monitoring circuit This system determines that there is an abnormality and prohibits the elevator from starting to run.

[Effect]

In a circuit configured in this way, the MPU checks the operation of the MPU operation monitoring circuit each time the start relay is activated, which automates the checking operation and greatly improves safety. .

〔Example〕

1 and 2 are circuit diagrams showing an embodiment of an elevator control system according to the present invention, and the same reference numerals as in FIG. 6 indicate the same or corresponding parts. In the figure, reference numeral 15a indicates a contact point of a traveling relay, and when the traveling relay is energized, the input capo (PI) of the input/output circuit 2 is activated. provides a signal indicating that the travel relay is operating. Reference numeral 5b denotes a contact of the starting relay, and when the starting relay is energized, the contact is closed and a signal indicating that the starting relay is in operation is supplied to the input capo Pl of the input/output circuit 2. lla is a contact point of the relay 11, and when the relay 11 is energized, it supplies a signal indicating that the relay 11 is in operation to the input port PI of the input/output circuit 2. Further, 11b is a normally open contact of the relay 11 connected in series to the relay 14.

FIG. 2 shows a monitoring circuit for checking the operation of the MPU operation monitoring circuit shown in FIG. Connected between A and B. 11c is a normally closed contact of the relay 11 connected in parallel to the contact 5d, and 15 is a running relay, which connects the power lines A and B to the normally open contact 16b of the time relay 16 and the circuit component 17. It is connected to the.

In the WII circuit as described above, when the starting relay is excited, its contact 5b is closed, and a signal indicating that the starting relay has operated is sent to the input/output circuit 2.
is supplied to the MPUI via the MPUI.

Then, the MPUI shifts to the MPU operation monitoring circuit drive mode and executes the operation of chart 70 shown in FIG.

That is, in step S1, it is determined whether the contact 5b is closed, and if the result of this determination is no, this determination is repeated. Then, when the starting relay is energized and its contact 5b is closed, the determination in step S1 is YES, so the process moves to step S2 and the MPU
After controlling the operation monitoring circuit 10 to operate, that is, to a state in which an abnormality is detected, the process moves to step S3. In step S3, it is determined whether the contact 11a is open, and if the determination is no, the same determination operation is repeated. If the contact 11a is closed within a predetermined period of time, the determination in step S3 becomes YES and the process moves to step S4. In step S4, after a predetermined period of time is measured, the process moves to step S5. Step S
In step 5, the check operation is ended by restoring the operation of the MPU operation monitoring circuit 10 that was forcibly activated. Here, when the MPU operation monitoring circuit 10 is forcibly activated, the output signal causes the relay 11 to drop out, thereby opening the contacts 11a and llb, and closing the contact 11c shown in Figures #&2.

Further, at this point, since the starting relay is operating, the contact 5c is closed and the contacts 5d and 5e are open. Therefore, the time limit relay 16 is in a state where it can drop out when a predetermined time limit is reached.

Here, if the MPUI, MPU operation monitoring circuit 10, and relay 11 are normal, the state shown in FIG. 4 (,) is reached.

At the same time that the starting relay is activated by the smell, its contact 5b
Since the output signal from the contact 5b causes the MPUI to shift to the check mode and force the MPU operation monitoring circuit 10 to operate immediately, the relay 11 switches to the state shown in FIG. 4(b) within a predetermined time. It should drop out as shown at time t2. And this relay 11
When the timer drops out, the contact 11c closes, and the timer relay 16 is energized again before it reaches a predetermined time limit and drops out. The operating state will continue as shown in . Therefore, since the contact point 16b continues to be closed, indicating that the check results of each part are normal, the travel relay 15 is activated in response to the travel command, and the elevator begins to travel.

Next, MPU1. MPU operation monitoring circuit 10 and relay 1
1 is abnormal, the start relay will switch to the 5th relay.
Even if the relay 11 is energized as shown at time t in FIG. 5(a), it does not perform the dropout operation as shown in FIG. 5(b). As a result, the timed relay 16 drops out at a time t when a predetermined time period T elapses from the time when the starting relay is activated, as shown in FIG. 5(c). When the time relay 16 drops out, its contact 16b is opened, and therefore the excitation of the running current 15 is prohibited even if a running command is issued, thereby preventing the elevator from running and ensuring safety.

〔Effect of the invention〕

As explained above, in the elevator control device according to the present invention, when the starting relay is excited, M P
The system is configured so that the U and MPU operation monitoring circuits are forcibly activated and the system does not start running unless there is a response within a predetermined time, so it is safe because an operation check is automatically performed each time the system starts. It has an excellent effect of significantly improving performance compared to conventional methods.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an example of an elevator control device according to the present invention, FIG. 2 is a circuit diagram showing an example of a check circuit, and FIG. 3 is an operation of the microcomputer shown in FIG. 1 in check mode. 70-chart diagram showing,
4(a) to (C) and 5(a) to (c) are operation waveform diagrams of each part showing the operation of the circuit shown in FIGS. 1 and 2,
FIG. 6 is a circuit diagram showing a conventional elevator control device. 1... Microcomputer (MPUL) 2... Input/output circuit, 3... Amplifier, 4... Three-phase AC power supply, 5
at 5 b...Start relay contact, 6...Motor control circuit, 7...Current detector, 8...Hoisting motor, 9...Speed detector, 10...MPU operation monitoring Circuit, 11.14... Relay, 11a-11c... Contact of relay 11, 15... Running relay, 15a... Contact of running relay 15, 16... Timed relay, 16a,
16b...Contact point of timed relay 16. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (2 idiots) Figure 2 Figure 3 Figure 4 Figure 5? J4 diagram

Claims (1)

[Claims] An elevator control unit using a microcomputer, a starting relay that is energized when the elevator is started, an MPU operation monitoring circuit that monitors the operation of the microcomputer, and a monitoring circuit check means that checks the operation of the MPU operation monitoring circuit. , a time limit circuit is provided for measuring a time period during which the monitoring circuit check means is allowed to operate with a delay from the activation of the starting relay, and when the starting relay is activated, the microcomputer is controlled to control the MPU operation monitoring circuit. An elevator control device characterized in that the elevator control device is configured to operate and prevent the elevator from starting to run if the monitoring circuit check means does not operate within a set time of the time limit circuit.